filipriec/stm32_rust
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This commit is contained in:
Priec
2025-11-05 14:45:36 +01:00
parent d57d16935d
commit 41c31f6b2a
4 changed files with 18 additions and 15 deletions
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20
dma_gpio/src/bin/main.rs
View File

@@ -14,7 +14,7 @@ use dma_gpio::software_uart::{
gpio_dma_uart_rx::rx_dma_task,
debug::dump_tim6_regs,
};
use dma_gpio::config::{BAUD, TX_PIN_BIT, RX_OVERSAMPLE, TX_OVERSAMPLE, UART_CFG};
use dma_gpio::config::{BAUD, TX_PIN_BIT, RX_OVERSAMPLE, TX_OVERSAMPLE};
use dma_gpio::config::{TX_RING_BYTES, RX_RING_BYTES, PIPE_RX_SIZE};
use static_cell::StaticCell;
use {defmt_rtt as _, panic_probe as _};
@@ -38,14 +38,14 @@ async fn main(spawner: Spawner) {
// Safe one-time init from StaticCell
let rx_ring: &mut [u8; RX_RING_BYTES] = RX_RING.init([0; RX_RING_BYTES]);
let tx_ring_mem: &mut [u32; TX_RING_BYTES] =
TX_RING.init([0; TX_RING_BYTES]);
let tx_ring_mem: &mut [u32; TX_RING_BYTES] = TX_RING.init([0; TX_RING_BYTES]);
// Spawn tasks
spawner.spawn(rx_dma_task(p.GPDMA1_CH1, &PIPE_RX, rx_ring).unwrap());
// Create and start the TX DMA ring in main.
let bsrr_ptr = embassy_stm32::pac::GPIOA.bsrr().as_ptr() as *mut u32;
// let bsrr_ptr = embassy_stm32::pac::GPIOA.bsrr().as_ptr() as *mut u32;
let odr_ptr = embassy_stm32::pac::GPIOA.odr().as_ptr() as *mut u32;
let mut tx_opts = TransferOptions::default();
tx_opts.half_transfer_ir = true;
tx_opts.complete_transfer_ir = true;
@@ -55,7 +55,7 @@ async fn main(spawner: Spawner) {
WritableRingBuffer::new(
p.GPDMA1_CH0,
TIM6_UP_REQ,
bsrr_ptr,
odr_ptr,
tx_ring_mem,
tx_opts,
)
@@ -65,13 +65,15 @@ async fn main(spawner: Spawner) {
info!("TX DMA ring started");
loop {
info!("tick start");
Timer::after(Duration::from_millis(100)).await;
info!("tick end");
write_uart_frames_to_ring(
&mut tx_ring,
TX_PIN_BIT,
b"Hello marshmallow\r\n",
&UART_CFG,
)
.await;
Timer::after(Duration::from_secs(2)).await;
).await;
info!("text");
Timer::after(Duration::from_secs(1)).await;
}
}

4
dma_gpio/src/software_uart/gpio_dma_uart_rx.rs
View File

@@ -6,7 +6,7 @@ use embassy_stm32::{
Peri,
};
use embassy_stm32::dma::{
ReadableRingBuffer as DmaRingRx,
ReadableRingBuffer,
TransferOptions,
};
use crate::config::{RX_OVERSAMPLE, UART_CFG};
@@ -30,7 +30,7 @@ pub async fn rx_dma_task(
opts.complete_transfer_ir = true;
// SAFETY: ring is exclusive to this task
let mut rx = unsafe { DmaRingRx::new(ch, TIM7_UP_REQ, gpioa_idr, ring, opts) };
let mut rx = unsafe { ReadableRingBuffer::new(ch, TIM7_UP_REQ, gpioa_idr, ring, opts) };
rx.start();
let mut chunk = [0u8; 256];

6
dma_gpio/src/software_uart/gpio_dma_uart_tx.rs
View File

@@ -1,7 +1,8 @@
// src/software_uart/gpio_dma_uart_tx.rs
use embassy_stm32::dma::Request;
use embassy_stm32::dma::WritableRingBuffer;
use crate::software_uart::uart_emulation::{UartConfig, encode_uart_byte_cfg};
use crate::software_uart::uart_emulation::encode_uart_byte_cfg;
use crate::config::UART_CFG;
// kapitola 17.4.11 - 2 casovace pre 2 DMA
pub const TIM6_UP_REQ: Request = 4; // Table 137: tim6_upd_dma, strana 687 STM32U5xx datasheet
@@ -11,11 +12,10 @@ pub async fn write_uart_frames_to_ring(
ring: &mut WritableRingBuffer<'static, u32>,
pin_bit: u8,
bytes: &[u8],
cfg: &UartConfig,
) {
for &b in bytes {
let mut frame = [0u32; 12];
let used = encode_uart_byte_cfg(pin_bit, b, cfg, &mut frame);
let used = encode_uart_byte_cfg(pin_bit, b, &UART_CFG, &mut frame);
// Will wait until all words are written
ring.write_exact(&frame[..used]).await.unwrap();

3
dma_gpio/src/software_uart/uart_emulation.rs
View File

@@ -40,7 +40,8 @@ pub fn encode_uart_byte_cfg(
) -> usize {
// GPIOx_BSRR register str. 636 kap. 13.4.7
let set_high = |bit: u8| -> u32 { 1u32 << bit };
let set_low = |bit: u8| -> u32 { 1u32 << (bit as u32 + 16) };
let set_low = |bit: u8| -> u32 { 0 };
// let set_low = |bit: u8| -> u32 { 1u32 << (bit as u32 + 16) };
let mut idx = 0usize;